fix(http-client-python): avoid _enums import for constant enum values in typeddict mode

[l0lawrence]

Problem

In models-mode: typeddict, enums are emitted as Literal aliases in types.py (e.g. Color = Literal["red", "blue"]) and _enums.py is never generated. However, a single constant enum value (EnumValue) still used the dpg-style annotation Literal[Color.RED] and imported Color from ..models._enums — a module that does not exist in typeddict mode, and an attribute (Color.RED) that a Literal alias does not have.

Fix

EnumValue, in typeddict mode only:

• type_annotation returns the raw literal value — Literal["red"] — instead of Literal[Color.RED].
• imports skips the _enums import (only typing.Literal is needed).

dpg / msrest behavior is unchanged. ConstantType is unaffected (it already uses primitive value types).

# models-mode: typeddict — before (broken)
from ..models._enums import Color   # _enums.py never generated
x: Literal[Color.RED]               # Color is a Literal alias, has no .RED

# after
from typing import Literal
x: Literal["red"]

This scenario is what I have a question on:

# models-mode: typeddict — before (broken)
from ..models._enums import Foo  # _enums.py never generated
Foo = Literal["bar"]
x: Literal[Foo.BAR]              

# after
from typing import Literal
Foo = Literal["bar"]   # enums are extensible so at any time Foo could become Foo = Literal["bar", "bar2"]????
x: Literal["bar"]

versus where it is the whole enum type

# models-mode: typeddict — before (broken)
from ..models._enums import Foo  # _enums.py never generated
Foo = Literal["bar"]
x: Foo        

# after
from typing import Literal
Foo = Literal["bar"]  
x: Foo

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npm i https://pkg.pr.new/@typespec/http-client-python@11212

commit: 662e27e

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - fix ✏️

Fix constant enum values referencing the nonexistent _enums module in models-mode: typeddict. In typeddict mode enums are emitted as Literal aliases in types.py and _enums.py is never generated, so a single constant enum value now annotates with its literal value (e.g. Literal["red"]) and no longer imports from _enums.

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[l0lawrence]

fixes #11210

[l0lawrence]

regen code here: https://github.com/Azure/azure-sdk-for-python/actions/runs/28984885700